jest.mock at module level

MockedFunction casting

clearAllMocks in beforeEach

mockResolvedValueOnce usage

toHaveBeenCalledWith verification

toHaveBeenCalledTimes verification

async/await pattern

rejects.toThrow for errors

describe/it structure

it() verb-first descriptions

no .only calls

not mocking subject under test

jest.mock at module level

MockedFunction casting

clearAllMocks in beforeEach

mockResolvedValueOnce usage

expect.assertions usage

rejects.toThrow or error response check

toHaveBeenCalledWith verification

toHaveBeenCalledTimes verification

async/await pattern

describe/it structure

it() verb-first descriptions

no .only calls

ts-jest preset

node testEnvironment

roots points to src

testMatch for .test.ts files

collectCoverageFrom set correctly

test script in package.json

test:watch script in package.json

test:coverage script in package.json

jest.config.ts uses export default

setupFilesAfterFramework referenced

ts-jest and jest devDependencies

jest.setup.ts file created

jest.spyOn for internal method

spy restoration

clearAllMocks in beforeEach

jest.mock for external dependencies

MockedFunction casting

mockReturnValueOnce or mockResolvedValueOnce

toHaveBeenCalledWith on spy

toHaveBeenCalledTimes on spy

not mocking subject under test

async/await pattern

describe/it structure

no .only calls

useFakeTimers in beforeEach

useRealTimers in afterEach

advanceTimersByTime usage

clearAllMocks in beforeEach

toHaveBeenCalledTimes verification

boundary condition tests

describe/it structure

it() verb-first descriptions

no .only calls

not mocking subject under test